Research On The Key Technologies And Inplementation Of The Physical Uplink Share Channel In LTE System

Time Division Long Term Evolution(TD-LTE) is a universal mobile communication standard formulated by the global communication enterprises and operators organized by the 3rd Generation Partnership Project(3GPP).Because of the low time delay,high transmission rate,wile coverage,high capacity and convenient networking,TD-LTE becomes the mainsteam standard of the new generation of the mobile communication.The Ministry of Industry and Information Technology of China issue the license of TD-LTE to China Mobile,China Telecom and China Unicom on 12 th December 2013,which means TD-LTE goes into commercial use in China.Based on TD-LTE protocal, this thesis study on the key technology and implement of the Physical Uplink Share Channel(PUSCH) in the LTE system, and the main work and achievements displays as followed:Firstly, this thesis studies the modules and key parameters of PSUCH, then constructs a simulation link of PUSCH.Through the comparison with the standard data of the LTE link constructed by the Vienna University, this thesis confirms the rightness of the simulation link.Secondly, this thesis studies on the implement of PUSCH on the TMDSEVM6670 L platform,.which is a quad core DSP Evaluation Module(EVM) designed for high-rate communication produced by the Texas Instruments(TI).It provides powerful peripheral interfaces as well as multicore navigators and coprocessors.1) This thesis studies on the multicore navigator and discusses the conception of queues, descriptors and channels.Then uses Fast Fourier Transform Coprocessor(FFTC) as an example to vertify the processing of multicore navigator.2) This thesis studies the Bit Coprocessor(BCP), which is able to improve the efficiency on bit processing, and FFTC, which is able to improve the efficiency on symble processing.Then uses coprocessor to finish constructing the PUSCH link and compare the transmission data with the data from MATLAB and Windows C development platform, after that a performance and complexity discussion is presented.This thesis also studies on the theory and implement on channel estimation.The typical Least Square(LS) and Minimum Mean Square Error(MMSE) algorithm are chose and compared in the typical TD-LTE channel Extend Pedestrian A(EPA) and Extend Vehicular A(EVA),LS algorithm is finally decided to be used in the PUSCH channel estimation because of the lower complexity.Finally,based on the processing of channel estimation,this thesis studies the scaling of local pilots.Q(16,3) and Q(16,2) are compared and analysed then Q(16,3) is chose for local pilots.The prevention of data from overflowing is studied particularly.This thesis also analyses and compares the precision of data from TMDSEVM6670 L and MATLAB,and informs that although the data precision on TMDSEVM6670 L is lower than the data on MATLAB,the error can be ignored. Therefore the data processing is reliable.